how to fix P0171 lean code in Genesis G70 IG (2017-2023)?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, basic hand tools (sockets, wrenches), MAF cleaner, fuel pressure gauge, vacuum pump.
• Ensure the vehicle is on a flat surface and the engine is cool.

2. Address Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or vacuum pump to detect leaks.
  3. Replace any damaged hoses or gaskets.

3. Clean the MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Use MAF cleaner to spray and clean the sensor elements carefully.
  4. Allow the sensor to dry completely before reinstalling.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
  3. Compare the reading to the manufacturer specifications (typically 55-65 psi for most vehicles).
  4. If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Use a multimeter to test the pre-catalytic converter oxygen sensor for proper voltage readings (typically 0.1 to 0.9 volts).
  2. Replace any faulty oxygen sensors as needed.